A dull, steady ache. Tightness or pressure on both sides of the head. If these symptoms sound familiar — you’re not alone. Tension headaches are the most common type of headache. About 3 out of 4 people in the U.S. experience tension headaches at some point in their lives. And women are more likely to get them than men. Although tension headaches are common and not life-threatening, symptoms can vary per person. So how do you know if what you’re experiencing is just a headache or something more serious?​Primary vs. secondary headache The big difference between primary and secondary headache is...